A Framework for Estimating Effects of Combustor Turbulence on Turbine Profile Loss Generation
Name
turbo_145_3_031018.pdf
Description
Published version
Size
1 MB
Format
Adobe PDF
Checksum (MD5)
1883ec5b5999a9e23f74180ed53b70b9
Author(s)
Gakhar, Kanika
Folk, Masha
Greitzer, Edward M
Tan, Choon S
Date Issued
January 6, 2023
Journal
Journal of Turbomachinery
Publisher
ASME International
Citation
Gakhar, K., Folk, M., Greitzer, E. M., and Tan, C. S. (January 6, 2023). "A Framework for Estimating Effects of Combustor Turbulence on Turbine Profile Loss Generation." ASME. J. Turbomach. March 2023; 145(3): 031018.
Version
Final published version
Abstract
This paper describes a framework to quantify the effect of freestream turbulence, generated by mixing processes in a combustor, on turbulent boundary layer loss generation in the high-pressure turbine downstream of the combustor. The regime of freestream turbulence common to gas turbine aero engines is identified and it is shown that the dissipation loss coefficient in this regime can be determined using existing measurements of the effect of freestream turbulence on skin friction. The paper shows that combustor-generated freestream turbulence can increase the profile loss coefficient of a typical high-pressure turbine blade by as much as 28%. A relation has been derived between a non-dimensional turbulence parameter, which characterizes the freestream turbulence, and the increase in turbine boundary layer dissipation, which quantifies the decrease in turbine efficiency. The relation provides guidelines for combustor turbulence modifications that lead to turbine performance benefits. The framework has been applied in example trade studies which show that increasing the size of dilution ports and increasing the length of the combustor can decrease high-pressure turbine profile loss generation to potentially increase stage efficiency up to 0.5%.
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1115/1.4056407
